characteristic that you can observe without changing the composition of the substance
characteristic that cannot be observed without altering
the form or appearance of matter changes, but not its composition
liquid changed into a gas
gas changed into a liquuid
solid changes directly into a gas
gas changes into a solid
substances are changed into different substances; the composition of the substance changes
law of conservation of mass
the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes
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